<template>
	<view>
		
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		
		 <view class="scroll-view-container">
		      <!-- 左侧的滚动视图区域 -->
		      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
		      </scroll-view>
		      <!-- 右侧的滚动视图区域 -->
		      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
			    <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题 -->
					<view class="cate-lv2-title">{{item2.cat_name}}</view>
					<!-- 当前二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的item项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类的文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
		      </scroll-view>
		    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用高度
				wh:0,
				cateList:[],
				active:0,
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo=uni.getSystemInfoSync()
			
			this.wh=sysInfo.windowHeight-50
			
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				//请求失败
				if(res.meta.status!==200) return uni.$showMsg()
				
				//请求成功，把获取到的数据放入轮播图的数据数组中
				this.cateList=res.message
				
				//为二级分类赋值
				this.cateLevel2=res.message[0].children
				
				uni.$showMsg('请求数据成功！')
			},
			activeChanged(i){
				this.active=i
				
				//重新为二级分类赋值
				 this.cateLevel2=this.cateList[i].children
				 
				 this.scrollTop=this.scrollTop===0?1:0
			},
			//跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				// console.log('OK')
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container{
		display: flex;
		
		.left-scroll-view{
			width: 120px;
			
			.left-scroll-view-item{
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				
				&.active{
					background-color:#00aaff;
					position: relative;
					
					&::before{
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color:#00ff00;
						position: absolute;
						top:50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
		}
	}
	
	.cate-lv2-title{
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			
			image{
				width: 60px;
				height: 60px;
			}
			
			text{
				font-size: 12px;
			}
		}
	}
</style>
